#### Carbon 60

The electronic states of C60 can be simulated using the Huckel model.
The corresponding 60x60 matrix is shown on the right side. The non-zero
elements, shown by a yellow dot, correspond to two nearest neighbors.
As each carbon atom has three neighbors, there are three non-zero elements per
line. This matrix can be diagonalized numerically by clicking on the button.
The energy levels are then shown on the right side.